Attachment Class

Attachment Class

 

Represents an attachment to an e-mail.

Namespace:   System.Net.Mail
Assembly:  System (in System.dll)

System.Object
  System.Net.Mail.AttachmentBase
    System.Net.Mail.Attachment

public class Attachment : AttachmentBase

NameDescription
System_CAPS_pubmethodAttachment(Stream, ContentType)

Initializes a new instance of the Attachment class with the specified stream and content type.

System_CAPS_pubmethodAttachment(Stream, String)

Initializes a new instance of the Attachment class with the specified stream and name.

System_CAPS_pubmethodAttachment(Stream, String, String)

Initializes a new instance of the Attachment class with the specified stream, name, and MIME type information.

System_CAPS_pubmethodAttachment(String)

Initializes a new instance of the Attachment class with the specified content string.

System_CAPS_pubmethodAttachment(String, ContentType)

Initializes a new instance of the Attachment class with the specified content string and ContentType.

System_CAPS_pubmethodAttachment(String, String)

Initializes a new instance of the Attachment class with the specified content string and MIME type information.

NameDescription
System_CAPS_pubpropertyContentDisposition

Gets the MIME content disposition for this attachment.

System_CAPS_pubpropertyContentId

Gets or sets the MIME content ID for this attachment.(Inherited from AttachmentBase.)

System_CAPS_pubpropertyContentStream

Gets the content stream of this attachment.(Inherited from AttachmentBase.)

System_CAPS_pubpropertyContentType

Gets the content type of this attachment.(Inherited from AttachmentBase.)

System_CAPS_pubpropertyName

Gets or sets the MIME content type name value in the content type associated with this attachment.

System_CAPS_pubpropertyNameEncoding

Specifies the encoding for the AttachmentName.

System_CAPS_pubpropertyTransferEncoding

Gets or sets the encoding of this attachment.(Inherited from AttachmentBase.)

NameDescription
System_CAPS_pubmethodSystem_CAPS_staticCreateAttachmentFromString(String, ContentType)

Creates a mail attachment using the content from the specified string, and the specified ContentType.

System_CAPS_pubmethodSystem_CAPS_staticCreateAttachmentFromString(String, String)

Creates a mail attachment using the content from the specified string, and the specified MIME content type name.

System_CAPS_pubmethodSystem_CAPS_staticCreateAttachmentFromString(String, String, Encoding, String)

Creates a mail attachment using the content from the specified string, the specified MIME content type name, character encoding, and MIME header information for the attachment.

System_CAPS_pubmethodDispose()

Releases the resources used by the AttachmentBase. (Inherited from AttachmentBase.)

System_CAPS_protmethodDispose(Boolean)

Releases the unmanaged resources used by the AttachmentBase and optionally releases the managed resources. (Inherited from AttachmentBase.)

System_CAPS_pubmethodEquals(Object)

Determines whether the specified object is equal to the current object.(Inherited from Object.)

System_CAPS_protmethodFinalize()

Allows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection.(Inherited from Object.)

System_CAPS_pubmethodGetHashCode()

Serves as the default hash function. (Inherited from Object.)

System_CAPS_pubmethodGetType()

Gets the Type of the current instance.(Inherited from Object.)

System_CAPS_protmethodMemberwiseClone()

Creates a shallow copy of the current Object.(Inherited from Object.)

System_CAPS_pubmethodToString()

Returns a string that represents the current object.(Inherited from Object.)

The Attachment class is used with the MailMessage class. All messages include a Body, which contains the content of the message. In addition to the body, you might want to send additional files. These are sent as attachments and are represented as Attachment instances. To add an attachment to a mail message, add it to the MailMessage.Attachments collection.

Attachment content can be a String, Stream, or file name. You can specify the content in an attachment by using any of the Attachment constructors.

The MIME Content-Type header information for the attachment is represented by the ContentType property. The Content-Type header specifies the media type and subtype and any associated parameters. Use ContentType to get the instance associated with an attachment.

The MIME Content-Disposition header is represented by the ContentDisposition property. The Content-Disposition header specifies the presentation and file time stamps for an attachment. A Content-Disposition header is sent only if the attachment is a file. Use the ContentDisposition property to get the instance associated with an attachment.

The MIME Content-Transfer-Encoding header is represented by the TransferEncoding property.

The following code example demonstrates attaching a file to an e-mail message.

public static void CreateMessageWithAttachment(string server)
{
	// Specify the file to be attached and sent.
	// This example assumes that a file named Data.xls exists in the
	// current working directory.
	string file = "data.xls";
	// Create a message and set up the recipients.
	MailMessage message = new MailMessage(
	   "jane@contoso.com",
	   "ben@contoso.com",
	   "Quarterly data report.",
	   "See the attached spreadsheet.");

	// Create  the file attachment for this e-mail message.
	Attachment data = new Attachment(file, MediaTypeNames.Application.Octet);
	// Add time stamp information for the file.
	ContentDisposition disposition = data.ContentDisposition;
	disposition.CreationDate = System.IO.File.GetCreationTime(file);
	disposition.ModificationDate = System.IO.File.GetLastWriteTime(file);
	disposition.ReadDate = System.IO.File.GetLastAccessTime(file);
	// Add the file attachment to this e-mail message.
	message.Attachments.Add(data);

	//Send the message.
	SmtpClient client = new SmtpClient(server);
	// Add credentials if the SMTP server requires them.
	client.Credentials = CredentialCache.DefaultNetworkCredentials;

    try {
	  client.Send(message);
	}
	catch (Exception ex) {
	  Console.WriteLine("Exception caught in CreateMessageWithAttachment(): {0}", 
                  ex.ToString() );			  
	}
	// Display the values in the ContentDisposition for the attachment.
	ContentDisposition cd = data.ContentDisposition;
	Console.WriteLine("Content disposition");
	Console.WriteLine(cd.ToString());
	Console.WriteLine("File {0}", cd.FileName);
	Console.WriteLine("Size {0}", cd.Size);
	Console.WriteLine("Creation {0}", cd.CreationDate);
	Console.WriteLine("Modification {0}", cd.ModificationDate);
	Console.WriteLine("Read {0}", cd.ReadDate);
	Console.WriteLine("Inline {0}", cd.Inline);
	Console.WriteLine("Parameters: {0}", cd.Parameters.Count);
	foreach (DictionaryEntry d in cd.Parameters)
	{
		Console.WriteLine("{0} = {1}", d.Key, d.Value);
	}
	data.Dispose();
}

.NET Framework
Available since 2.0

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

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